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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...int64_t start;
uint64_t end;
int __d0;
asm volatile ("rdtsc\n\tshl $32, %%rdx\n\tor %%rdx, %0" : "=a" (start) : : "%rdx");
mutex.lock();
mutex.unlock();
asm volatile ("rdtsc\n\tshl $32, %%rdx\n\tor %%rdx, %0" : "=a" (end) : : "%rdx");
asm volatile ("\n1:\n\tdecl %%ecx\n\tjnz 1b" : "=c...
JavaScript get window X/Y position for scroll
...
.wrapper{
position: fixed;
top:20px;
left:0px;
width:320px;
background: black;
color: green;
height: 64px;
}
.wrapper div{
display: inline;
width: 50%;
float: left;
text-align: center;
line-height: 64px
}
.horizontalScroll{color: oran...
How to delete every other line in Vim?
...
We can use :normal or :norm to execute given normal mode commands. Source.
:%norm jdd
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What is a Python egg?
...kages. It’s just an alternative to a source code distribution or Windows exe. But note that for pure Python, the .egg file is completely cross-platform.
The .egg file itself is essentially a .zip file. If you change the extension to “zip”, you can see that it will have folders inside the arch...
np.mean() vs np.average() in Python NumPy?
... axes 0 and 1, I get wildly incorrect results unless I specify dtype='float64':
>T.shape
(4096, 4096, 720)
>T.dtype
dtype('<f4')
m1 = np.average(T, axis=(0,1)) # garbage
m2 = np.mean(T, axis=(0,1)) # the same garbage
m3 = np.mean(T, axis=(0,1), dtype='fl...
what is faster: in_array or isset? [closed]
...
David HarknessDavid Harkness
32.9k1010 gold badges102102 silver badges124124 bronze badges
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What is the most effective way for float and double comparison?
...r Hickey
30.2k1818 gold badges118118 silver badges223223 bronze badges
answered Aug 20 '08 at 2:14
OJ.OJ.
26.7k55 gold badges5252 ...
Best way to change the background color for an NSView
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When building for 64-bit or iOS or building 32-bit like 64-bit, NSRect is just another way of saying CGRect. If not, however, these are independent structs, and even though they might consist of the same members, they can never be “toll-free-bridged” as that is a t...
How to Save Console.WriteLine Output to Text File
...nd initialize as a private static readonly. In the [ClassCleanup] method I execute Dispose()
– IAbstract
Feb 16 '17 at 22:41
18
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How can I programmatically determine if my app is running in the iphone simulator?
...ct behavior.
– Anton
Jan 9 '10 at 9:32
7
Perhaps the need to include TargetConditionals has been ...